95 AWD Safari vibration

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95 AWD Safari vibration

Postby casabalvr [OP] » June 8th 2009, 3:00pm

I have a 95 AWD Safari with 174000 miles on it and I am trying to eliminate a mild shake at speed 55-75 mph. I just replaced the tires with Goodrich Long Trail 225 70 15 radials. Does anyone have any ideas as to the source...ujoints, something bent, alignment. Any advice would be greatly appreciated.

Thank you, Brad
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Re: 95 AWD Safari vibration

Postby ihatemybike » June 8th 2009, 4:58pm

Where does the vibration feel like it's coming from? Several things can cause vibration.

Grumpy was curbed this past winter and thus the passenger side wheel bearing causes a heck of a vibration, but I can tell it's coming from that corner.
Aaron

2005 Astro (Gandalf) - AWD, 4.3L, 3.42, 130k+ miles
1997 Astro (Grumpy - $250 Rally Van) - AWD, 4.3L, 3.42, LSD, 2" lift, 31" tires, 335k+ orig engine, $30 eBay fuel pump
Prev Astros:99,97,00,94,87,86
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Re: 95 AWD Safari vibration

Postby nomo » June 8th 2009, 10:30pm

Did the vibration start soon after the new tires? If so, it's very possible that they didn't get the tires properly balanced or you threw a wheel weight that they didn't get securely attached.
1995 Astro AWD CL w/rear air and "w" code engine
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Re: 95 AWD Safari vibration

Postby Matrixx » June 9th 2009, 6:28am

Hi casabalvr

If the vibration started after the new tires were installed, then I would have to agree with what nomo said. It "could" also be a defective new tire from the factory (out of round) which is a common thing nowadays (unfortunately).:)
96-GMC Safari - Rwd - Original Transmission - Exhaust - Air Cared - 3.73 Limited Slip Rear End - Motor Replaced - 91 octane (Chevron) for the last 14 years - MFI Upgrade - 640,000 Kilometers.
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Re: 95 AWD Safari vibration

Postby casabalvr [OP] » June 9th 2009, 2:35pm

Thank you for the responses but I don't think the vibration is a result of the tires. I had the previous set
rotated and balanced about two weeks ago and although that improved the problem it did not eliminate it. I was wondering if something could be bent or worn out or if this was acommon issue with an AWD Safari?
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Re: 95 AWD Safari vibration

Postby GaryZ » June 9th 2009, 4:45pm

My AWD eats idler arms. I have changed them every other year since I bought the van. Test them by trying to move the tie-rod up and down. It should move very little. Bad idler arms will allow the tie-rod to move a half inch or more.
'98 Astro AWD, white with gray interior,
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Re: 95 AWD Safari vibration

Postby astrosafari » June 9th 2009, 10:35pm

TRY CHECKING THE FRONT AXLE NUTS. I HAD A BAD VIBRATION IN MY 94 SAFARI AND FOUND THEM LOOSE HOPE THIS HELPS.
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